<style>
body {
  margin: 0;
}

.scroller {
  will-change: transform;

  overflow: auto;
  width: 200px;
  height: 500px;
  outline: 2px solid black;
}

.container {
  width: 200px;
  height: 1000px;
}

.first {
  position: relative;
  top: 400px;
  height: 100px;
  width: 200px;
  background-color: green;
}

.second {
  position: relative;
  top: 400px;
  height: 100px;
  width: 200px;
  background-color: yellow;
}

.third {
  position: relative;
  top: 400px;
  height: 100px;
  width: 200px;
  background-color: pink;
}

.fourth {
  position: relative;
  top: 400px;
  height: 100px;
  width: 200px;
  background-color: blue;
}

.fifth {
  position: relative;
  top: 400px;
  height: 100px;
  width: 200px;
  background-color: red;
}
</style>

<script>
window.addEventListener('load', function() {
  document.querySelector('.scroller').scrollTop = 400;
});
</script>

<div class="scroller">
  <div class="container">
    <div class="first"></div>
    <div class="second"></div>
    <div class="third"></div>
    <div class="fourth"></div>
    <div class="fifth"></div>
  </div>
</div>
